What Is a Solar Power Purchase Agreement (PPA)? A Simple Guide for Indian Businesses

You have probably heard a solar vendor pitch to you that they will install a rooftop solar system for your business for free, you spend nothing upfront, and just pay for the power you use. You might have just nodded along but assumed it to be a scam. But that too-good-to-be-true arrangement has a name. It is called a solar power purchase agreement, or simply, a solar PPA.

Under a solar PPA, the developer funds, owns, operates, and maintains the industrial rooftop solar system, while your business buys the electricity it generates. Commercial rooftop solar PPA rates in India generally range from Rs. 3 to Rs. 4.5 per kWh, depending on the project size, location, and contract terms.

This allows your business to switch to lower-cost solar electricity without purchasing or managing the rooftop solar system itself.

Simply put, in a PPA solar arrangement, you pay only for the power, not the PPA solar panels installed on your roof.

The reason this matters is what businesses currently pay for grid power.

For high-consumption businesses in India, electricity has turned into one of the highest recurring operational costs. High-tension industrial grid tariffs range between Rs. 8 and Rs. 12 per kWh across most states, and the number climbs every year. At the same time, the Renewable Purchase Obligation targets from the Ministry of Power continue to tighten. As a result, businesses are under pressure to spend less money on power and draw more of it from clean sources.

For capital-heavy sectors like steel, cement, and textiles, that is hard to solve, because the cash that might fund a solar plant is already being used to run core operations.

A solar PPA power purchase agreement resolves both problems at once.

• It cuts the power bills by up to 70% and moves the business toward clean energy.
• It does so without the upfront cost or the operational work of owning a plant.

That’s precisely why the PPA solar program is now used for most new commercial solar installations in the country.

This guide covers how a solar panel purchase agreement works in India, the types available to you, what solar PPA price per kW looks like in 2026, the clauses worth negotiating, and the risks to weigh before you sign a solar rooftop PPA in India.

What is a Solar Power Purchase Agreement, and why is it Important for Businesses?

A solar power purchase agreement is a long-term contract between your business and a solar developer. The developer installs, owns, and maintains the solar power system, and your business buys the electricity it generates at a tariff agreed in advance.

You adopt solar energy without spending capital upfront, and pay only for the units the system actually produces.

Here’s how this arrangement works in simple terms:

• You are buying the power, not the PPA solar panels.
• The developer carries the cost of building the plant and the responsibility of keeping it running well.
• You receive electricity at current solar PPA rates fixed by your developer, which is below your grid tariff.

Since you don’t own the asset but buy its output, the PPA power purchase agreement model works for businesses that would rather invest their capital in core operations.

Importance of a Solar PPA Explained for Indian Businesses

For most commercial and industrial consumers in India, a solar PPA lowers electricity bills, which is a recurring cost. It also helps move the business toward cleaner energy without forcing a heavy investment or a new operational burden.

The benefits below explain why a commercial PPA has become the default route for C&I solar.

• Lower electricity costs from day one: Solar power under a commercial solar PPA is cheaper than grid power. As a result, the savings show up in the very first billing cycle rather than years down the line.
• No capital expenditure: The business funds nothing upfront because commercial solar PPA providers (aka developers) pay to build and maintain the system, which keeps the cost off your balance sheet as an operating expense.
• Protection against rising tariffs: Grid rates climb almost every year. With a long-term solar power agreement, your tariff stays fixed. Therefore, you can plan your energy costs with more confidence.
• Lower risk for your business: The developer handles power generation, maintenance, and performance checks.
• Supports your sustainability goals: The power you purchase under a solar power purchase agreement comes from solar renewable energy. This helps your business reduce carbon emissions and move closer to its ESG goals and RPO requirements.
• Improved cash flow: You save on your energy bills without paying anything upfront. This keeps more money available for daily business needs and growth.

Key Features of a Solar Power Purchase Agreement at a Glance

The features below describe how the PPA agreement for a solar installation is structured and what each side (the business and the developer) is responsible for.

• Zero upfront investment: The developer pays for, builds, and connects the full solar system. Your business does not need to spend capital to switch to solar.
• Developer-owned and managed system: In addition to funding and owning the plant, the developer handles its maintenance and insurance throughout the contract. This keeps most of the cost and risk with them.
• Pay only for the power you use: You are billed only for the solar power your business actually uses, based on a per-unit rate. You do not pay a fixed fee for unused power.
• Lower tariff than grid power: The PPA price per kWh is lower than your DISCOM tariff. This is where the savings actually come from.
• Long-term contract: Most commercial PPA solar contracts run for 15 to 25 years. This gives your business long-term price certainty in return for a long-term commitment.
• Fixed or pre-agreed rate increase: Some commercial PPAs maintain the same tariff for the entire contract term. Others start at a lower rate and increase by a pre-decided 2% to 5% each year. These terms decide your long-term power cost.
• Risk stays with the developer: The developer handles technology issues, power generation risk, and maintenance costs throughout the contract. These risks do not pass to your business.
• Option to own the solar system later: Most green PPA contracts allow your business to take ownership of the solar power plant after the contract ends, often at a small or nominal value.
• Available in three structures: You can sign a commercial PPA as an on-site captive, a group captive, or a third-party open-access, each with a different cost and regulatory profile.

A few developers also offer a prepaid solar power purchase agreement, in which the business pays a lump sum upfront at a lower per-unit rate, though this trades away the zero-upfront benefit that makes the model attractive in the first place.

How Does a Solar PPA Work in India?

A solar power purchase agreement (also known as a solar energy procurement agreement) is not signed in one go. It moves through a few key stages in which your power usage, tariff, site conditions, savings, approvals, and contract terms are reviewed. The PPA is also the backbone of project finance for the developer, since the guaranteed payments let them raise debt against the plant.

Here’s a list of critical clauses you must consider when negotiating solar power purchase agreements.

1. Needs and load assessment: This is done to check whether a solar PPA makes sense for your business. The developer studies your electricity bills, monthly consumption, connected load, demand pattern, sanctioned load, peak usage hours, and current DISCOM tariff.
2. Structure selection: Once the solar power requirement is clear, the business chooses the best solar PPA structure. This could be on-site captive, group captive, or third-party open access. The best option depends on your power demand, available space, state rules, taxes, wheeling charges, and the level of control or ownership you want.
3. Developer sourcing and tariff benchmarking: In this step, the business compares different solar power purchase agreement companies and their offers. You look at their experience, financial strength, project track record, plant performance, service quality, and proposed tariff. Then, you compare the offered power purchase agreement rates with your current grid tariff to determine whether the savings are sufficient.
4. Contract negotiation and SERC approvals: This is where the commercial and legal terms of the solar power PPA contract are finalized. The agreement should clearly mention the per-unit PPA cost, escalation, contract period, billing method, minimum offtake, payment terms, exit clauses, performance guarantees, maintenance responsibility, insurance, and ownership transfer terms. For open-access or captive projects, state-level approvals may also be required from the SERC, DISCOM, SLDC, or other relevant authorities.
5. Plant commissioning: After approvals and contract signing, the developer builds the solar plant. This includes engineering design, equipment purchase, installation, grid connection, testing, safety checks, and final commissioning. Once the plant is live, it starts supplying solar power to your business as per the PPA.
6. Per-unit billing: Billing begins once the plant starts generating power. Your business pays only for the solar units it uses, usually measured in rupees per kWh. The monthly invoice shows the units generated or supplied, the agreed solar power purchase agreement rates, applicable charges, and total payable amount.

What are the Different Types of Solar PPAs in India?

The type of solar PPA you choose matters because each model works differently. It affects who owns the plant, what approvals you need, what charges apply, and how much control your business has over the project.

In India, solar PPAs usually fall into four main types. Each one fits a different business need, depending on your power use, location, budget, and regulatory requirements.

1. On-site captive solar PPA: In this model, the PPA solar system is installed at your own site, either on the rooftop or on open land. The power is used at the same location where it is generated, so it does not pass through the grid. This helps your business avoid many open access charges and DISCOM surcharges. It works best when you have enough roof space for the solar plant.
2. Group captive solar PPA: In this model, several businesses share power from one solar plant. This works well when one business does not have enough space for solar installation. The buyers together own ~26% of the company that owns the plant and must use ~51% of the power generated. This structure helps them qualify as captive consumers and avoid cross-subsidy surcharges, which makes it cheaper than a third-party solar PPA over time.
3. Third-party open access Solar PPA: In this model, an independent developer owns the PPA PV solar system at another location and supplies power to your business through the state grid. Since your business does not own any part of the project, there is no upfront investment or equity requirement. However, you must pay open access charges such as wheeling charges, transmission charges, cross-subsidy surcharge, and additional surcharge. These charges can increase the final cost of power. Thus, it is important to carefully review the solar power purchase agreement price before signing the contract.
4. Virtual or financial PPA: In virtual PPA solar model, your business does not receive solar power directly. Instead, it signs a financial contract with the developer. The developer sells power in the market, and your business pays or receives the difference between the agreed price and the market price. The renewable energy benefits can still be credited to your business to meet RPO compliance. This model is still new in India and is mainly used by large corporate buyers.

What PPA Tariff Rates Look Like in India in 2026?

Solar PPA rates are usually the first thing businesses want to check. In India, utility-scale solar PPA rates in recent SECI auctions have been reported to be as low as Rs. 2.56-2.57 per kWh.

• For commercial and industrial rooftop solar projects in 2026, the average solar PPA rates usually range from ~Rs. 3.0 to ~Rs. 4.5 per kWh.
• The final commercial solar PPA rates depend on your state, project size, site conditions, and PPA structure.

The above-listed solar PPA prices become more attractive when compared with HT industrial grid tariffs, which are often ~Rs. 7.5 to ~Rs. 12 per kWh.

However, it is also important to note that the charges in addition to PPA tariffs are not uniform across the country. Each state’s regulator sets them, and the local distribution utility collects them. So, the final rate you pay depends on which area your facility sits in.

• In Bengaluru, open-access consumers fall under BESCOM, and a BESCOM solar power purchase arrangement has some of the lowest wheeling charges in the country.
• In Maharashtra, the cross-subsidy surcharge for the HT industry and wheeling charges can be a little high.
• Gujarat adds another layer, because parts of the state are served by private distribution licensees rather than a state DISCOM. Therefore, a Torrent Power solar agreement in Ahmedabad or Surat follows that licensee’s own approved charges.

Always calculate the net effective tariff for your specific location before comparing a PPA to your grid bill, since two identical plants in two states can have very different solar PPA rates.

PPA Rate Comparison Table

The low PPA tariff rates come from large projects where developers sign a solar power plant PPA with government agencies like SECI, usually won through a competitive RFP for a solar power purchase agreement. A business signing a private PPA solar contract pays more than these auction rates, but still well below the grid.

The table below provides a broad range of current PPA prices in India. Use them as a starting point, not as final quotes, because the actual cost can change based on state charges, approvals, and project terms.

DISCLAIMER: These prices and savings are indicative only and may change based on the PPA tenure, project size, location, DISCOM tariff, open access charges, taxes, approvals, and contract terms. A longer PPA tenure may offer a lower per-unit rate, while shorter contracts may come with higher tariffs. Always check the final PPA price per MWh or kWh before signing the contract.

Solar PPA vs Buying Your Own System: Which Model Fits Your Business?

A business usually has two options for going solar.

• You can buy the system yourself under the CAPEX model.
• You can sign a solar power purchase agreement and pay only for the power the developer supplies.

In CAPEX, you own the plant, pay the upfront cost, and keep the full savings. In a PPA, the developer owns and maintains the plant, while you buy solar power at an agreed tariff.

The table below compares both CAPEX and OPEX/RESCO models side by side.

What a PPA Contract Contains: Key Clauses to Understand

A solar purchase agreement (PPA) may look simple on the surface, where the developer supplies power, and your business pays per unit. But the real value of the agreement depends heavily on the contract clauses. These clauses decide your tariff, savings, exit options, risk, and flexibility over the next 10 to 25 years.

Before you sign, review the following terms carefully.

• PPA tariff rate and escalation cap: The starting solar corporate PPA tariff decides your savings from day one. So, compare it with your current grid tariff. Also, check whether the tariff is fixed or increases every year. Even a small annual escalation can make a large difference over a long contract. Push for a low and clearly defined escalation cap.
• Minimum offtake obligation: This clause of your solar energy power purchase agreement says how much solar power your business must buy each year. It should match your actual power use, not an inflated estimate. If the minimum offtake is too high, you may end up paying for power your business does not need or cannot consume.
• Performance guarantee: The developer should commit to a minimum level of solar generation. This protects your savings because lower generation means you will buy more expensive power from the grid. The rooftop solar power purchase agreement should also mention the key solar equipment, such as panels, inverters, meters, and monitoring systems. This ensures the developer cannot use inferior-quality components later.
• Mid-term buyout option: Check whether you can purchase the PPA solar system during the term, and at what valuation, since this provides a path to ownership if your circumstances change.
• Early exit/termination clause: A long-term corporate solar PPA can be difficult to exit if your business moves, shuts a site, changes ownership, or no longer needs the same power load. The contract should clearly state when you can terminate the agreement and what penalty you must pay. Avoid clauses where the exit cost is unclear or too high.
• Governing law and dispute resolution: This clause decides how disputes will be handled if something goes wrong. It should clearly mention the applicable law, arbitration process, jurisdiction, timelines, and venue. Clear dispute terms prevent delays and confusion later, especially in large projects under the utility-scale solar PPA, where billing, performance, or approval issues can arise.

Risks of a Solar PPA for Indian Businesses

A solar PPA can lower your power cost without an upfront investment, but it also locks your business into a long-term contract. The risks can come from tariff escalation, minimum purchase commitments, open access charges, regulatory changes, exit penalties, and developer performance.

Before signing a solar panel power purchase agreement, you must check each of the following risks against your actual power use, site plans, cash flow, and long-term business needs.

• Surcharges can reduce the savings: In high-surcharge states, open access charges and DISCOM surcharges can eat away a large share of projected savings, and in the worst cases, the net effective solar PPA tariff creeps close to grid tariffs.
• The lock-in is long: A 10- to 25-year contract is difficult and expensive to leave, which becomes a problem if your load falls sharply or your business relocates.
• The developer’s financial profile matters: The developer owns and runs the plant for the full contract period. If the developer is financially weak, you may face project delays, lower power generation, poor system maintenance, or even contract failure.
• Wrong load planning can cost you dearly: If you sign a solar PPA contract for more power than you need, you may pay for unused units. If you contract for too little, you will still depend on expensive grid power for part of your demand. This is why accurate power-use planning is important.
• State rules can change: Open-access charges, banking rules, and RPO credit rules vary by state. These rules can also change during the contract, which may affect your savings and compliance benefits.

Step-by-Step: How to Get a Solar PPA for Your Business?

Getting a solar PPA includes choosing the lowest tariff, checking your actual power consumption, reviewing developer offers, confirming approvals, and understanding the billing terms before signing the contract.

The steps below show how the process works, from checking your current electricity bills to receiving your first solar invoice.

1. Calculate your baseline: Pull the last 12 months of electricity bills to establish your monthly consumption and the average grid tariff you pay today, which is the figure against which every saving will be measured.
2. Assess your rooftop or off-site potential: Bring in a developer for a feasibility study to confirm whether an on-site, rooftop, or open access setup fits your site and load.
3. Request proposals from at least three developers: Compare them on tariff, escalation, tenure, performance guarantee, and exit terms, so that you are judging solar PPA providers on the same metrics.
4. Calculate the net effective tariff: For off-site and open-access projects, do not focus only on the basic solar PPA rate. Add wheeling charges, cross-subsidy surcharge, banking charges, and other applicable costs. This final per-unit cost shows your real savings.
5. Run a legal review: Have a lawyer go through the solar PPA contract with particular attention to the buyout clause, the termination penalty, and the dispute resolution mechanism.
6. Sign and begin installation: Expect ~4 to 6 months from signing to commissioning, depending on the project’s size.
7. Start monthly billing: Once the plant begins generating power, the developer issues a bill based on the units recorded by the meter and the agreed-upon PPA rate. You should also check the inverter or monitoring dashboard to confirm that the billed units match the actual power generated.

Conclusion

A solar power purchase agreement (solar PV PPA) can help Indian businesses reduce electricity costs, use cleaner power, and avoid the upfront cost of installing a commercial solar system. The developer pays for, builds, runs, and maintains the system. Your business simply buys the solar power at an agreed per-unit power purchase agreement cost.

But a solar PPA purchase agreement works well only when the contract clauses are clear. The final savings depend on your power use, PPA structure, state-level charges, tariff escalation, lock-in period, and exit terms.

Before you buy PPA solar energy or sign any contract, compare the final power purchase agreement price per kWh with your current grid tariff, check the developer’s track record, and have the agreement properly reviewed. With the right structure and terms, a PPA solar agreement can be a smart way to lower energy bills and meet sustainability goals.

For any further details on installing a rooftop solar system for your business, you can also book a free solar consultation call with SolarSquare.

FAQs

Is a solar power purchase agreement worth it?

For most high-consumption businesses, yes. A solar PPA, aka a solar energy purchase agreement, delivers immediate savings, shields you from rising grid tariffs, and removes the burden of owning and maintaining the system. However, always confirm the net effective tariff in your state, since that reflects the true savings.

What is a solar storage PPA?

A solar storage PPA bundles battery storage with the plant so it can supply power after daylight hours. It is an emerging option for businesses that operate at night.

What is the cost of a solar PPA for businesses in India?

There is usually no upfront PPA cost to enter a solar PPA contract. You pay only for the electricity you consume at the agreed rate, which in 2026 generally falls between ~Rs. 3 and ~Rs. 4.5 per kWh, depending on the size of the project, the location, and the contract terms.

Is a solar PPA cheaper than owning the system?

This is not always true. Owning a solar system under the CAPEX model delivers the lowest electricity cost over the asset’s lifetime and allows businesses to claim depreciation benefits. However, buying PPA solar energy rather than owning the plant offers immediate savings with zero upfront capital investment and no operational responsibility. The better option depends on your capital availability and return expectations.

Can you exit a solar PPA early?

Yes, this is possible. However, most PPA solar plans that include early termination provisions may impose termination charges or buyout clauses. The exact terms vary by contract, so businesses should carefully review exit conditions before signing.

What is the difference between an IPP and a PPA?

An Independent Power Producer (IPP) is the company that develops, owns, and operates the solar project. A Power Purchase Agreement (PPA) is the legal contract under which the customer agrees to buy electricity from the IPP at predetermined terms and tariffs.

What is a PPA commonly used for?

Green power purchase agreements are widely used by commercial and industrial consumers, data centers, factories, warehouses, hospitals, hotels, and educational institutions to source renewable energy without a large investment. Institutions such as schools, hospitals, and trusts, including solar PPA for churches and religious institutions, use the same model to lower their energy bills without owning the system.

What is the difference between residential solar PPA vs commercial solar PPA?

A residential solar power purchase agreement is a contract where a developer installs a small rooftop system on a home and the household buys the power it generates. A commercial solar panel agreement works the same way for a business, but on a much larger scale, covering factories, offices, and warehouses with systems ranging from hundreds of kilowatts to several megawatts.

Commercial solar power purchase agreements are more prevalent in India, as they help businesses achieve significant energy cost savings while avoiding upfront capital expenditure. Here are the differences between the two discussed in detail: